Fountain pen nib



FIG. 1 is a front elevational view of a fountain pen nib showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view.

The right side is a mirror image of the left. 

The ornamental design for a fountain pen nib, as shown and described. 